James Tully’s scholarship has profoundly transformed the study of political thought by reconstructing the practice of political theory as a democratising and diversifying dialogue between scholars and citizens. Across his writings on topics ranging from the historical origins of property, constitutionalism in diverse societies, imperialism and globalisation, and global citizenship in an era of climate crisis, Tully has developed a participatory mode of political theorising and political change called public philosophy. This practice-oriented approach to political thought and its active role in the struggles of citizens has posed fundamental challenges to modern political thought and launched new lines of inquiry in the study of constitutionalism, democracy and citizenship, settler colonialism, comparative political theory, nonviolence, and ecological sustainability. James Tully: To Think and Act Differently collects classic, contemporary, and previously unpublished writings from across Tully’s four decades of scholarship to shed new light on these dialogues of reciprocal elucidation with citizens, scholars, and the history of political thought, and the ways Tully has enlarged our understanding of democracy, diversity, and the task of political theory.